Lattice dislocations which consisted of pairs of 1/3[112] super-partials that bounded extended superlattice intrinsic stacking faults were studied by means of transmission electron microscopy. They were found to react independently to antiphase boundary-coupled ½[110] pairs in the commonly observed pure screw orientation. It was observed that B had marked effects upon the populations of boundary types, upon the grain size and upon grain growth. In addition, small amounts of B completely eliminated widely extended stacking faults. It was concluded that effects of B additions, other than their influence upon boundary cohesion, were important. This had implications for the Kear-Wilsdorf type of locking mechanism and for the deformation behavior.

Dislocation Structures and the Character of Superdislocations in Ni3Al Alloys. Kerans, R.J., Hirth, J.P., Clark, W.A.T.: Acta Metallurgica et Materialia, 1995, 43[1], 277-85